641579 has 2 divisors, whose sum is σ = 641580. Its totient is φ = 641578.

The previous prime is 641551. The next prime is 641581. The reversal of 641579 is 975146.

It is a happy number.

641579 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-641579 is a prime.

It is a super-2 number, since 2×641579² = 823247226482, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 641581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (641519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320789 + 320790.

It is an arithmetic number, because the mean of its divisors is an integer number (320790).

2⁶⁴¹⁵⁷⁹ is an apocalyptic number.

641579 is a deficient number, since it is larger than the sum of its proper divisors (1).

641579 is an equidigital number, since it uses as much as digits as its factorization.

641579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 641579 is about 800.9862670483. The cubic root of 641579 is about 86.2482013207.

The spelling of 641579 in words is "six hundred forty-one thousand, five hundred seventy-nine".